I think you would like something like this :
A LVM (or dm- device mapper) layer which sits between the RAID layer and
the physical disks. This layer computes checksums as data is written to
the physical disks, and checks read data against these checksums.
Problem is, where do you store the checksums ? You need a rather fast,
non-volatile memory to do this. An interesting option would be an USB key.
However, flash memory has a limited number of write cycles. Some scheme
would be needed to not always overwrite the same spot on the flash memory.
Interesting...
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